Nouns

(n)wellbeing, well-being, welfare, upbeat, eudaemonia, eudaimoniaa contented state of being happy and healthy and prosperous“the town was finally on the upbeat after our recent troubles”
(n)upbeat, offbeatan unaccented beat (especially the last beat of a measure)

Adjectives

(s)cheerful, pollyannaish, upbeatpleasantly (even unrealistically) optimistic